Bmw x5 ( e70 ) 08 UPGRADE help

[klantech]

Hi Guys , sort of a newbie question and help required.

I want to do an invisible type upgrade on my x5 . I rather NOT change my head unit so i am considering the following .

1) Replace the 4" stock speaker on doors with these

http://www.amazon.com/100A1-Component-Speakers-System-Grills/dp/B00K6MZTR6/ref=sr_1_30?s=car&ie=UTF8&qid=1448498219&sr=1-30&keywords=4+component+speakers&refinements=p_n_size_browse-bin%3A1293692011

2) Replace the speakers under the seat with these :

http://www.amazon.com/Earthquake-Sound-SWS-6-5X-6-5-inch-Subwoofers/dp/B008MAG9YG/ref=sr_1_1?ie=UTF8&qid=1448501633&sr=8-1&keywords=sws+6+%22

3) Use a single 10" dual coil 4 ohm ( already have )

Can you suggest :

1) A single amp that i can use to run the system ? Would a 6 channel amp be best ?

2) Would i need a eq to tune it since i am using the stock HU ?

3) Would i need any special attachment from the Hu to the amp ?

4) Any other changes or suggestions will be greatly appreciated.

Thanks in advance ...

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